AW50-40LE Shift Solenoid A & B for Aisin Warner AW50-42LE 1989-Up

AW50-40LE / AW50-42LE Shift Solenoid A & B for 1989-Up Aisin Warner automatic transmissions.

OEM Reference: 5040310002N
Common Reference Numbers: 59955A, A89421, A89421A

This replacement transmission shift solenoid is used for the Shift A and Shift B positions on applicable AW50-40LE and AW50-42LE valve bodies. It is designed to help restore proper electronic shift control when a failed or worn shift solenoid contributes to delayed engagement, harsh gear changes, irregular shifts, or shift-related diagnostic issues.

Fitment:

• Aisin Warner AW50-40LE

• Aisin Warner AW50-42LE

• 1989-Up applications

Important Fitment Notes:

• Shift Solenoid A and Shift Solenoid B are interchangeable on applicable units.

• Verify the original solenoid’s location, connector design, and OEM reference before ordering.

• AW50-40LE and AW50-42LE transmissions may use either a 4-solenoid or 5-solenoid valve body; confirm your configuration before purchase.

• Does not fit AW55-50SN or AW55-51SN transmissions.

• Professional diagnosis and installation are recommended.

For a complete transmission service, use the correct manufacturer-specified ATF. Lubegard ATF Protectant may be used where appropriate for the particular transmission fluid application.